QBManager

GENERAL ORGANIC CHEMISTRY

231454 Stability of iso-butylene can be best explained by

1 Inductive effect

2 Mesomeric effect

3 Hyperconjugative effect

4 Steric effect

Explanation:

Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $α$ $H$ have higher the hyperconjugative structures. In isobutylene-

There are 6- $α H$ , then it have six hyperconjugative structure. Hence, 'c' option is correct.

J and K CET-(2010)

GENERAL ORGANIC CHEMISTRY

231455 Which is most acidic of the following?

1 methane

2 acetylene

3 1-butene

4 neo-pentane

Explanation:

Acetylene is most acidic because acetelene have $50 %$ s-character. The order of acidity is-
acetylene $> 1$ -butene $>$ methane $\approx$ neo-pentane

J and K CET-(2005)

GENERAL ORGANIC CHEMISTRY

231456 The correct order of decreasing acidic nature of
$H_{2} O, ROH, CH \equiv CH$ and ${NH}_{3}$ is

1

CH \equiv CH > H_{2} O > ROH > {NH}_{3}

2

H_{2} O > ROH > CH \equiv CH > {NH}_{3}

3

ROH > {NH}_{3} > CH \equiv CH > H_{2} O

4

H_{2} O > ROH > {NH}_{3} > CH \equiv CH

Explanation:

By the help of $pKa$ value we find the acidic order in $H_{2} O, R - OH, CH \equiv CH$ and ${NH}_{3}$ .
original image
Hence, the decreasing order of acidic strength is $H_{2} O > ROH > CH \equiv CH > {NH}_{3}$
Hence, 'b' option is correct.

J and K CET-2005

GENERAL ORGANIC CHEMISTRY

231457 Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound

1

{NH}_{2}

2

{NO}_{2}

3

{SO}_{3} H

4

N_{2}

Explanation:

${NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound.

By the resonating structure of aniline we can see that aniline is ortho para directing.

J and K CET-(2007)

GENERAL ORGANIC CHEMISTRY

231458 Chlorobenzene is $o, p$ -directing in electrophilic substitution reaction. The directing influence is explained by

1

+ M

of

Ph

2

+ I

of

Cl

3

+ M

of

Cl

4 - I of

Ph

.

Explanation:

The $Cl$ is a-I-effective group. In one hand $Cl$ attract electrons towards its shell and other hand it push the electron by $+ m$ (mesomaric effect). The outer six electron pushed by $+ m$ effect. The diagram is shown below-

(-) charge density is at ortho and para position. Hence, 'c' option is correct.

J and K CET-(2006)

GENERAL ORGANIC CHEMISTRY

231454 Stability of iso-butylene can be best explained by

1 Inductive effect

2 Mesomeric effect

3 Hyperconjugative effect

4 Steric effect

Explanation:

Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $α$ $H$ have higher the hyperconjugative structures. In isobutylene-

There are 6- $α H$ , then it have six hyperconjugative structure. Hence, 'c' option is correct.

J and K CET-(2010)

GENERAL ORGANIC CHEMISTRY

231455 Which is most acidic of the following?

1 methane

2 acetylene

3 1-butene

4 neo-pentane

Explanation:

Acetylene is most acidic because acetelene have $50 %$ s-character. The order of acidity is-
acetylene $> 1$ -butene $>$ methane $\approx$ neo-pentane

J and K CET-(2005)

GENERAL ORGANIC CHEMISTRY

231456 The correct order of decreasing acidic nature of
$H_{2} O, ROH, CH \equiv CH$ and ${NH}_{3}$ is

1

CH \equiv CH > H_{2} O > ROH > {NH}_{3}

2

H_{2} O > ROH > CH \equiv CH > {NH}_{3}

3

ROH > {NH}_{3} > CH \equiv CH > H_{2} O

4

H_{2} O > ROH > {NH}_{3} > CH \equiv CH

Explanation:

By the help of $pKa$ value we find the acidic order in $H_{2} O, R - OH, CH \equiv CH$ and ${NH}_{3}$ .
original image
Hence, the decreasing order of acidic strength is $H_{2} O > ROH > CH \equiv CH > {NH}_{3}$
Hence, 'b' option is correct.

J and K CET-2005

GENERAL ORGANIC CHEMISTRY

231457 Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound

1

{NH}_{2}

2

{NO}_{2}

3

{SO}_{3} H

4

N_{2}

Explanation:

${NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound.

By the resonating structure of aniline we can see that aniline is ortho para directing.

J and K CET-(2007)

GENERAL ORGANIC CHEMISTRY

231458 Chlorobenzene is $o, p$ -directing in electrophilic substitution reaction. The directing influence is explained by

1

+ M

of

Ph

2

+ I

of

Cl

3

+ M

of

Cl

4 - I of

Ph

.

Explanation:

The $Cl$ is a-I-effective group. In one hand $Cl$ attract electrons towards its shell and other hand it push the electron by $+ m$ (mesomaric effect). The outer six electron pushed by $+ m$ effect. The diagram is shown below-

(-) charge density is at ortho and para position. Hence, 'c' option is correct.

J and K CET-(2006)

GENERAL ORGANIC CHEMISTRY

231454 Stability of iso-butylene can be best explained by

1 Inductive effect

2 Mesomeric effect

3 Hyperconjugative effect

4 Steric effect

Explanation:

Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $α$ $H$ have higher the hyperconjugative structures. In isobutylene-

There are 6- $α H$ , then it have six hyperconjugative structure. Hence, 'c' option is correct.

J and K CET-(2010)

GENERAL ORGANIC CHEMISTRY

231455 Which is most acidic of the following?

1 methane

2 acetylene

3 1-butene

4 neo-pentane

Explanation:

Acetylene is most acidic because acetelene have $50 %$ s-character. The order of acidity is-
acetylene $> 1$ -butene $>$ methane $\approx$ neo-pentane

J and K CET-(2005)

GENERAL ORGANIC CHEMISTRY

231456 The correct order of decreasing acidic nature of
$H_{2} O, ROH, CH \equiv CH$ and ${NH}_{3}$ is

1

CH \equiv CH > H_{2} O > ROH > {NH}_{3}

2

H_{2} O > ROH > CH \equiv CH > {NH}_{3}

3

ROH > {NH}_{3} > CH \equiv CH > H_{2} O

4

H_{2} O > ROH > {NH}_{3} > CH \equiv CH

Explanation:

By the help of $pKa$ value we find the acidic order in $H_{2} O, R - OH, CH \equiv CH$ and ${NH}_{3}$ .
original image
Hence, the decreasing order of acidic strength is $H_{2} O > ROH > CH \equiv CH > {NH}_{3}$
Hence, 'b' option is correct.

J and K CET-2005

GENERAL ORGANIC CHEMISTRY

231457 Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound

1

{NH}_{2}

2

{NO}_{2}

3

{SO}_{3} H

4

N_{2}

Explanation:

${NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound.

By the resonating structure of aniline we can see that aniline is ortho para directing.

J and K CET-(2007)

GENERAL ORGANIC CHEMISTRY

231458 Chlorobenzene is $o, p$ -directing in electrophilic substitution reaction. The directing influence is explained by

1

+ M

of

Ph

2

+ I

of

Cl

3

+ M

of

Cl

4 - I of

Ph

.

Explanation:

The $Cl$ is a-I-effective group. In one hand $Cl$ attract electrons towards its shell and other hand it push the electron by $+ m$ (mesomaric effect). The outer six electron pushed by $+ m$ effect. The diagram is shown below-

(-) charge density is at ortho and para position. Hence, 'c' option is correct.

J and K CET-(2006)

GENERAL ORGANIC CHEMISTRY

231454 Stability of iso-butylene can be best explained by

1 Inductive effect

2 Mesomeric effect

3 Hyperconjugative effect

4 Steric effect

Explanation:

Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $α$ $H$ have higher the hyperconjugative structures. In isobutylene-

There are 6- $α H$ , then it have six hyperconjugative structure. Hence, 'c' option is correct.

J and K CET-(2010)

GENERAL ORGANIC CHEMISTRY

231455 Which is most acidic of the following?

1 methane

2 acetylene

3 1-butene

4 neo-pentane

Explanation:

Acetylene is most acidic because acetelene have $50 %$ s-character. The order of acidity is-
acetylene $> 1$ -butene $>$ methane $\approx$ neo-pentane

J and K CET-(2005)

GENERAL ORGANIC CHEMISTRY

231456 The correct order of decreasing acidic nature of
$H_{2} O, ROH, CH \equiv CH$ and ${NH}_{3}$ is

1

CH \equiv CH > H_{2} O > ROH > {NH}_{3}

2

H_{2} O > ROH > CH \equiv CH > {NH}_{3}

3

ROH > {NH}_{3} > CH \equiv CH > H_{2} O

4

H_{2} O > ROH > {NH}_{3} > CH \equiv CH

Explanation:

By the help of $pKa$ value we find the acidic order in $H_{2} O, R - OH, CH \equiv CH$ and ${NH}_{3}$ .
original image
Hence, the decreasing order of acidic strength is $H_{2} O > ROH > CH \equiv CH > {NH}_{3}$
Hence, 'b' option is correct.

J and K CET-2005

GENERAL ORGANIC CHEMISTRY

231457 Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound

1

{NH}_{2}

2

{NO}_{2}

3

{SO}_{3} H

4

N_{2}

Explanation:

${NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound.

By the resonating structure of aniline we can see that aniline is ortho para directing.

J and K CET-(2007)

GENERAL ORGANIC CHEMISTRY

231458 Chlorobenzene is $o, p$ -directing in electrophilic substitution reaction. The directing influence is explained by

1

+ M

of

Ph

2

+ I

of

Cl

3

+ M

of

Cl

4 - I of

Ph

.

Explanation:

The $Cl$ is a-I-effective group. In one hand $Cl$ attract electrons towards its shell and other hand it push the electron by $+ m$ (mesomaric effect). The outer six electron pushed by $+ m$ effect. The diagram is shown below-

(-) charge density is at ortho and para position. Hence, 'c' option is correct.

J and K CET-(2006)

GENERAL ORGANIC CHEMISTRY

231454 Stability of iso-butylene can be best explained by

1 Inductive effect

2 Mesomeric effect

3 Hyperconjugative effect

4 Steric effect

Explanation:

Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $α$ $H$ have higher the hyperconjugative structures. In isobutylene-

There are 6- $α H$ , then it have six hyperconjugative structure. Hence, 'c' option is correct.

J and K CET-(2010)

GENERAL ORGANIC CHEMISTRY

231455 Which is most acidic of the following?

1 methane

2 acetylene

3 1-butene

4 neo-pentane

Explanation:

Acetylene is most acidic because acetelene have $50 %$ s-character. The order of acidity is-
acetylene $> 1$ -butene $>$ methane $\approx$ neo-pentane

J and K CET-(2005)

GENERAL ORGANIC CHEMISTRY

231456 The correct order of decreasing acidic nature of
$H_{2} O, ROH, CH \equiv CH$ and ${NH}_{3}$ is

1

CH \equiv CH > H_{2} O > ROH > {NH}_{3}

2

H_{2} O > ROH > CH \equiv CH > {NH}_{3}

3

ROH > {NH}_{3} > CH \equiv CH > H_{2} O

4

H_{2} O > ROH > {NH}_{3} > CH \equiv CH

Explanation:

By the help of $pKa$ value we find the acidic order in $H_{2} O, R - OH, CH \equiv CH$ and ${NH}_{3}$ .
original image
Hence, the decreasing order of acidic strength is $H_{2} O > ROH > CH \equiv CH > {NH}_{3}$
Hence, 'b' option is correct.

J and K CET-2005

GENERAL ORGANIC CHEMISTRY

231457 Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound

1

{NH}_{2}

2

{NO}_{2}

3

{SO}_{3} H

4

N_{2}

Explanation:

${NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound.

By the resonating structure of aniline we can see that aniline is ortho para directing.

J and K CET-(2007)

GENERAL ORGANIC CHEMISTRY

231458 Chlorobenzene is $o, p$ -directing in electrophilic substitution reaction. The directing influence is explained by

1

+ M

of

Ph

2

+ I

of

Cl

3

+ M

of

Cl

4 - I of

Ph

.

Explanation:

The $Cl$ is a-I-effective group. In one hand $Cl$ attract electrons towards its shell and other hand it push the electron by $+ m$ (mesomaric effect). The outer six electron pushed by $+ m$ effect. The diagram is shown below-

(-) charge density is at ortho and para position. Hence, 'c' option is correct.

J and K CET-(2006)

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Question Bank Series

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation:

Explanation: